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Hardness, set-recovery and micromorphology studies of densified and thermally modified wood
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0001-8514-5409
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials. SP Tech Res Inst Sweden.ORCID iD: 0000-0001-7014-6230
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-9156-3161
Department of Forest Products Technology, Aalto University.
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2015 (English)Conference paper, Published paper (Other academic)
Abstract [en]

The purpose of the work reported in this paper was to increase the density of Scots pine wood in order to improve its hardness. Density was increased by compressing the porous structure of wood between heated metal plates in the radial direction by 40, 50 or 60% of the thickness. The compressed state was stabilised by thermally modifying (TM) the samples at 200 °C under steam conditions for 2, 4 or 6h. Set-recovery was almost eliminated (<1%) with TM of 6h for samples compressed 40 and 50%. It was discovered that hardness of densified wood was in some cases even three times higher compared to untreated wood. However, the hardness of the densified, non-TM wood was reduced after soaking and drying back to the original untreated level, while TM of 4 and 6h maintained an increased level of hardness.

Place, publisher, year, edition, pages
2015.
Keywords [en]
densification, hardness, SEM, set-recovery, thermal modification, UV-laser ablation
National Category
Wood Science
Identifiers
URN: urn:nbn:se:kth:diva-205570OAI: oai:DiVA.org:kth-205570DiVA, id: diva2:1089255
Conference
The 8th European Conference of Wood Modification. 26.-27.10.2015, Helsinki, Finland.
Note

The authors would like to thank Joachim Seltman (SP, Sweden) and Niko Tuominen (Aalto University) for technical support. The study was supported by the EcoBuild Centre, Stiftelsen Nils och Dorthi Troëdssons forskningsfond and the Finnish Cultural Foundation. QC 20170424

Available from: 2017-04-19 Created: 2017-04-19 Last updated: 2017-04-24Bibliographically approved

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Laine, KristiinaSegerholm, KristofferWålinder, MagnusKällbom, Susanna
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